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Bacteriocins ? properties and antimicrobial activity

100%

Gwiazdowsk D. , Trojanowska K.

Biotechnologia

2005

nr 1

114-130

Bacteriocins are heterogeneous group of ribosomally synthesized proteins or peptides produced by different bacteria that kill or inhibit growth of other bacteria. The interest in bacteriocins results from their potential application as biopreservatives in food to inhibit the growth of spoilage or pathogen bacteria In this paper identification of these metabolites and their physical and biochemical properties, including spectrum of activity, terms of size, amino acid sequence, modes of action and immunity mechanisms are presented.

Factors influencing biological activity of composts

100%

Stachowiak B. , Trojanowska K.

Biotechnologia

2003

nr 1

138-150

Composts and their water extracts are often characterised by biological activity. These properties are not consistent, however. This review describes the factors influencing biological activity of composts and also presents a practical possibility of using composts in biological control diseases caused by plantpathogenes.

Batch propionic acid fermentation using propionibacterium sp. immobilized in different supports

100%

Czaczyk K. , Trojanowska K.

Biotechnologia

1998

nr 1

188-198

Propionibacterium freudenreichii subsp. shermanii 1 and 4 were immobilized in the living state in 2, 3 and 4% alginate gels, in 2, 4 and 6% carrageenan gels, in 2, 4 and 6% carrageenan/locust bean gum gels and on ceramic support. Ammonia consumption, glucose utilization, production of propionic and acetic acids, biosynthesis of vitamin B12 and cell release rate were examined. A significant increase of productivity of propionic acid and decrease of biosynthesis of vitamin B12 using immobilized cells were observed. The best results were obtained in the fermentation with strains immobilized in 4% alginate gel, when applied for the third time. In this case, production of propionic acid was 50% higher in comparison with free cells and biosynthesis of vitamin B12 was lower or the same as in the control.